Search Results - "Agranat, A. J."

Observation of Fermi-Pasta-Ulam-Tsingou Recurrence and Its Exact Dynamics by Pierangeli, D., Flammini, M., Zhang, L., Marcucci, G., Agranat, A. J., Grinevich, P. G., Santini, P. M., Conti, C., DelRe, E.

“…One of the most controversial phenomena in nonlinear dynamics is the reappearance of initial conditions. Celebrated as the Fermi-Pasta-Ulam-Tsingou problem,…”
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Spatial Rogue Waves in Photorefractive Ferroelectrics by Pierangeli, D, Di Mei, F, Conti, C, Agranat, A J, DelRe, E

“…Rogue waves are observed as light propagates in the extreme nonlinear regime that occurs when a photorefractive ferroelectric crystal is undergoing a…”
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Scale-free optics and diffractionless waves in nanodisordered ferroelectrics by DelRe, E, Spinozzi, E, Agranat, A. J, Conti, C

“…Wavelength rigidly fixes the diffraction that distorts waves during propagation, and poses fundamental limits to imaging, microscopy and communication. This…”
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Turbulent Transitions in Optical Wave Propagation by Pierangeli, D, Di Mei, F, Di Domenico, G, Agranat, A J, Conti, C, DelRe, E

“…We report the direct observation of the onset of turbulence in propagating one-dimensional optical waves. The transition occurs as the disordered hosting…”
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Super-crystals in composite ferroelectrics by Pierangeli, D., Ferraro, M., Di Mei, F., Di Domenico, G., de Oliveira, C. E. M., Agranat, A. J., DelRe, E.

“…As atoms and molecules condense to form solids, a crystalline state can emerge with its highly ordered geometry and subnanometric lattice constant. In some…”
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Intrinsic Negative Mass from Nonlinearity by Di Mei, F, Caramazza, P, Pierangeli, D, Di Domenico, G, Ilan, H, Agranat, A J, Di Porto, P, DelRe, E

“…We propose and provide experimental evidence of a mechanism able to support negative intrinsic effective mass. The idea is to use a shape-sensitive…”
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Photorefractive light needles in glassy nanodisordered KNTN by Pierangeli, D, Parravicini, J, Di Mei, F, Parravicini, G B, Agranat, A J, DelRe, E

“…We study the formation of 2D self-trapped beams in nanodisordered potassium-sodium-tantalate-niobate (KNTN) cooled below the dynamic glass transition…”
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Continuous Solitons in a Lattice Nonlinearity by Pierangeli, D, Flammini, M, Di Mei, F, Parravicini, J, de Oliveira, C E M, Agranat, A J, DelRe, E

“…We study theoretically and experimentally the propagation of optical solitons in a lattice nonlinearity, a periodic pattern that both affects and is strongly…”
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Observation of an intrinsic nonlinearity in the electro-optic response of freezing relaxors ferroelectrics by Pierangeli, D., Di Mei, F., Parravicini, J., Parravicini, GB, Agranat, A. J., Conti, C., DelRe, E.

“…We demonstrate an electro-optic response that is linear in the amplitude but independent of the sign of the applied electric field. The symmetry-preserving…”
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Electro-activation and electro-morphing of photorefractive funnel waveguides by Pierangelo, A, Ciattoni, A, Palange, E, Agranat, A J, DelRe, E

“…We demonstrate the electro-activation of funnel waveguides through the quadratic electro-optic effect in paraelectric potassiumlithium- tantalate-niobate. This…”
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Giant broadband refraction in the visible in a ferroelectric perovskite by Di Mei, F., Falsi, L., Flammini, M., Pierangeli, D., Di Porto, P., Agranat, A. J., DelRe, E.

“…In principle, materials with a broadband giant index of refraction ( n  > 10) overcome chromatic aberration and shrink the diffraction limit down to the…”
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Glass-forming liquid kinetics manifested in a KTN: Cu crystal by BEN ISHAI, P, DE OLIVEIRA, C. E. M, RYABOV, Y, FELDMAN, Yu, AGRANAT, A. J

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Rejuvenation in scale-free optics and enhanced diffraction cancellation life-time by Parravicini, J, Conti, C, Agranat, A J, DelRe, E

“…We demonstrate rejuvenation in scale-free optical propagation. The phenomenon is caused by the non-ergodic relaxation of the dipolar glass that mediates the…”
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Unusual glass-like systems – relaxation dynamics of Cu + ions in ferroelectric KTN crystals by Ben Ishai, P., de Oliveira, C.E.M., Ryabov, Y., Agranat, A.J., Feldman, Yu

“…We present a broadband dielectric spectroscopy study of potassium tantalate niobate (KTN) crystals, doped with varying amounts of Cu ions. The dielectric…”
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Aging solitons in photorefractive dipolar glasses by Parravicini, J, Pierangeli, D, Di Mei, F, Conti, C, Agranat, A J, DelRe, E

“…We study experimentally the aging of optical spatial solitons in a dipolar glass hosted by a nanodisordered sample of photorefractive…”
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Anti-diffracting beams through the diffusive optical nonlinearity by Di Mei, F, Parravicini, J, Pierangeli, D, Conti, C, Agranat, A J, DelRe, E

“…Anti-diffraction is a theoretically predicted nonlinear optical phenomenon that occurs when a light beam spontaneously focalizes independently of its…”
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Controlled composition modulation in potassium lithium tantalate niobate crystals grown by off-centered TSSG method by de Oliveira, C.E.M., Orr, G., Axelrold, N., Agranat, A.J.

“…Off-centered top-seeded solution growth (TSSG) method is demonstrated as an effective and simple way to generate controlled composition modulation in potassium…”
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Diffraction cancellation over multiple wavelengths in photorefractive dipolar glasses by Parravicini, J, Di Mei, F, Conti, C, Agranat, A J, DelRe, E

“…We report the simultaneous diffraction cancellation for beams of different wavelengths in out-of-equilibrium dipolar glass. The effect is supported by the…”
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Observation of electro-activated localized structures in broad area VCSELs by Parravicini, J, Brambilla, M, Columbo, L, Prati, F, Rizza, C, Tissoni, G, Agranat, A J, DelRe, E

“…We demonstrate experimentally the electro-activation of a localized optical structure in a coherently driven broad-area vertical-cavity surface-emitting laser…”
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Giant Broadband Refraction in the Visible in a Disordered Ferroelectric Perovskite by Falsi, L., di Mei, F., Flammini, M., Ptet-Anaeli, D., di Por'to, P., Agranat, A. J., DelRe, E. E.

“…In this work we report broadband refraction and diffraction experiments in a ferroelectric perovskite, a solid-solution K 0.997 Ta 0.64 Nb 0 .36:Li 0.003…”
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